JP3875959B2 - Flow control valve - Google Patents

Flow control valve Download PDF

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Publication number
JP3875959B2
JP3875959B2 JP2003088114A JP2003088114A JP3875959B2 JP 3875959 B2 JP3875959 B2 JP 3875959B2 JP 2003088114 A JP2003088114 A JP 2003088114A JP 2003088114 A JP2003088114 A JP 2003088114A JP 3875959 B2 JP3875959 B2 JP 3875959B2
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Japan
Prior art keywords
valve
main valve
flow rate
fluid
flow path
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JP2003088114A
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JP2004293695A (en
Inventor
泰彦 渡辺
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泰彦 渡辺
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flow control valve for a liquid using a solenoid, and in particular, the voltage applied to the solenoid and the flow rate of the fluid are linearly proportional, and the flow rate of several hundred liters per minute can be controlled. The present invention relates to a flow control valve that can be applied to a relatively large engine.
[0002]
[Prior art]
In the flow control of liquid fuel for temperature adjustment in a boiler or the like, for example, a method in which an operator manually operates a needle valve while watching the temperature of the boiler has been adopted. Also, as shown in FIG. 6, a plurality of valves V that can be controlled to open and close by a pulse signal are connected in parallel in the middle of the fuel pipe, and the flow rate of the fuel is obtained by combining opening and closing of each valve V by electrical operation. A multistage switching valve system for adjusting the pressure has also been used.
[0003]
According to such a conventional method, there is a problem in that the flow rate adjustment range is generally narrow, and the pressure of the fluid changes as the flow rate changes. In particular, the multi-stage switching valve system is configured to automatically control the flow rate of the fuel according to the temperature of the boiler because it can be electrically switched, but each valve V is on-off controlled, The flow rate must be adjusted step by step, and fine control was not possible. There is also a problem that troubles are likely to occur in the opening and closing portions of the valves V.
[0004]
Therefore, in order to solve the above problems, the present applicant has proposed a flow control valve and a flow control method as shown in Patent Document 1 and Patent Document 2.
[0005]
[Patent Document 1]
Japanese Patent Publication No. 7-26702
[Patent Document 2]
Japanese Patent Publication No. 7-26703
[0006]
The flow control valve disclosed by the present applicant in Patent Document 1 and Patent Document 2 is a flow control valve using a solenoid, and is based on an operating force of a solenoid that moves the valve body and a moving resistance plate attached to the valve body. By finely balancing the resistance force, the voltage applied to the solenoid and the amount of valve movement can be made proportional to each other continuously and linearly, and the flow rate of the liquid can be proportionally controlled with the pressure almost constant over a wide adjustment range. Is.
[0007]
[Problems to be solved by the invention]
However, according to this flow rate control valve, the flow rate of the fluid that can be controlled is at most about several liters to several tens of liters per minute, and it has been impossible to proportionally control a large flow rate beyond this. In other words, this flow control valve is proportional to the voltage in a relatively small range of opening of the valve by causing the urging forces of the solenoid and the resistance plate to act directly on the valve body for the above-described relatively low flow rate fluid. It is adjusted as follows. For this reason, when this is increased in size, the displacement of the heavy valve element must be controlled in a relatively wide range. This is achieved by using a large solenoid and a large moving resistance plate to It was extremely difficult to adjust the ratio so that the
[0008]
However, in the field of flow rate control, there has been a strong demand for continuous control of fine voltage and flow rate proportionally using a solenoid even in the above-described large flow rate range.
[0009]
Therefore, an object of the present invention is to provide a flow rate control valve capable of proportionally controlling the flow rate of liquid by continuously and linearly proportional to the voltage applied to the solenoid and the amount of movement of the valve body. An object of the present invention is to provide a flow control valve capable of proportional control even at a large flow rate of about 10 liters to several hundred liters.
[0010]
Another object of the present invention is to adjust the relief valve in advance in the flow rate control valve so that the flow rate of the fluid supplied through the pilot valve and the opening of the flow path by the main valve are Is to set the continuous and linear proportional relationship between the voltage applied to the solenoid and the amount of movement of the main valve in accordance with the flow rate and pressure of the fluid to be controlled.
[0011]
Another object of the present invention is to provide a voltage applied to a solenoid and a valve by amplifying the pressure of the fluid guided from the inlet side of the flow path and reliably transmitting the pressure to the main valve in the flow control valve. The purpose is to reliably set a continuous and linear proportional relationship of the amount of movement of the body.
[0012]
[Means for Solving the Problems]
  The flow control valve according to claim 1 is:
  A fluid flow path having an inlet and an outlet;
  A main valve provided in the middle of the flow path to open and close the flow path;
  Urging means for urging the main valve in a direction to close the flow path;
  A branch path provided in communication with the main valve on the inlet side of the flow path;
  A pilot valve provided in the branch path to open and close the branch path;
  A leaf spring that urges the pilot valve moving in the direction to open the branch path in the opposite direction;
  A solenoid for energizing the pilot valve in a direction in which the branch path is opened when energized;
  The main valve is attached to the main valve, and moves when the pilot valve opens the branch path when the fluid supplied from the branch path acts to move the main valve in the direction in which the flow path is opened. A main valve operating means,
  Have
  The elasticity of the leaf spring is set so that the voltage applied to the solenoid and the flow rate of the fluid supplied from the branch path when the pilot valve is moved by the solenoid to which the voltage is applied are in a proportional relationship. Flow control valveBecause,
  It has a cylindrical body formed by combining the upper body and the lower body,
  The flow path, the main valve, and the biasing means are provided in the lower body,
  The pilot valve, the leaf spring, and the solenoid are provided in the upper body,
  The branch path is provided and communicated with the upper body and the lower body,
  The branch passage of the upper body communicates with a first liquid chamber provided in an opening on the lower surface of the upper body;
  The outlet side of the flow path related to the main valve of the lower body communicates with a second liquid chamber provided to open on the upper surface of the lower body,
  The main valve operating means includes a diaphragm that is sandwiched between the combined upper body and the lower body to isolate the first liquid chamber and the second liquid chamber, and in the flow path of the lower body. And connecting means for connecting the diaphragm and the main valve.In the flow control valve to
  The upper body is provided with an adjustable relief valve that allows a part of the fluid to escape to an external system by forming a hole communicating with the outside in the branch path between the pilot valve and the diaphragm, and allows the fluid to escape to the outside. By freely adjusting the flow rate of the fluid, the pilot valve moves so that the flow rate of the fluid supplied from the branch path to the diaphragm is proportional to the opening of the flow path by the main valve.It is characterized by that.
[0013]
  According to such a configuration, when a voltage is applied to the solenoid, the leaf spring is deformed to open the pilot valve. The fluid passes through the branch path from the inlet side of the flow path, and applies pressure to the main valve operating means via the pilot valve. The main valve operating means transmits the force due to the pressure of the applied fluid to the main valve and moves the main valve in the opening direction against the biasing means, so that the fluid flows through the main valve to the outlet.When the pilot valve is opened by applying a voltage to the solenoid, the leaf spring becomes a resistance within a range where the driving force by the solenoid increases rapidly, and the movement of the pilot valve is restricted. Therefore, the pilot valve opens by a lift amount proportional to the voltage. . Thereby, proportional control as the whole flow control valve is suitably performed.
[0015]
  Further, according to such a configuration, it is possible to realize a compact configuration in which a complicated structure in which a main valve, a pilot valve, and a diaphragm for amplifying and transmitting pressure are integrated is integrated into the main body as a whole. In addition, the inside of the branch path can be cleaned by removing a closing member such as a screw during maintenance. Further, since the pressure of the fluid that has passed through the pilot valve can be reliably transmitted to the main valve by the diaphragm, a continuous and linear proportional relationship between the voltage applied to the solenoid and the opening of the main valve can be set reliably.
  And in the structure which produces such an effect, by adjusting the relief valve in advance and freely adjusting the flow rate of the fluid to be released outside, a continuous and linear proportional relationship between the voltage applied to the solenoid and the opening of the main valve is obtained. It can be reliably set according to the flow rate or pressure of the fluid to be controlled.
[0019]
According to this configuration, by adjusting the relief valve in advance, the continuous and linear proportional relationship between the voltage applied to the solenoid and the opening of the main valve can be ensured according to the flow rate, pressure, etc. of the fluid to be controlled. Can be set to
[0020]
  Claim2The flow rate control valve according to claim 1 is a flow rate control valve according to claim 1, wherein a through hole communicating with the flow path is formed in the lower surface of the lower main body, and the through hole can be freely advanced and retracted. An adjustment member is provided, and the urging means is provided between the inner surface of the adjustment member and the main valve.
[0021]
According to this configuration, the biasing force applied to the main valve by the biasing means can be appropriately adjusted by adjusting the mounting position of the adjustment member with respect to the lower main body. The flow rate adjusting operation for setting the continuous and linear proportional relationship of the valve opening can be performed more precisely and efficiently.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
The flow control valve of this example shown in FIG. 1 has a cylindrical main body 1 composed of a lower main body 2 and an upper main body 3. A fluid flow path 4 is formed inside the lower body 2, and the flow path 4 has an inlet 5 and an outlet 6 opened on the side circumferential surface. An annular valve seat 7 is formed coaxially with the central axis of the lower main body 2 that is cylindrical in the middle of the flow path 4 that is the center position of the lower main body 2. A main valve 8 is provided in the flow path 4 below the valve seat 7 so that the main valve 8 comes into contact with the lower side to close the opening of the valve seat 7. A guide shaft 9 is provided on the lower surface side of the main valve 8. Further, a through hole 2a communicating with the flow path 4 is formed at the bottom of the lower main body 2, and a substantially disk-shaped adjusting member 10 is attached to the through hole 2a by a screw structure so that the position can be adjusted. Yes. A guide hole 10a is formed in the center of the inner surface of the adjusting member 10, and the guide shaft 9 of the main valve 8 is inserted into the guide hole 10a, so that the main valve 8 has a predetermined range in the vertical direction. The opening of the valve seat 7 can be opened and closed by being guided movably within the valve seat 7. Further, a spring 11 as an urging member is provided between a locking step 8a on the lower surface of the main valve 8 and an annular holding groove 10b formed on the upper surface of the adjusting member 10, and the flow The main valve 8 is urged in a direction to close the passage 4.
The position of the adjusting member 10 that can be adjusted with a screw structure is that the spring 11 can adjust the biasing force applied to the main valve 8 to arbitrarily adjust the force when moving the main valve 8 in the opening direction. Because.
[0023]
In the flow path 4, a branch path 12 is provided on the inlet 5 side of the flow path 4 that is in front of the main valve 8. The branch path 12 is a path that bypasses a part of the fluid that has entered from the inlet 5 of the flow path 4, is formed continuously in the upper body 3, and is a pilot provided at the center of the upper body 3. Connected to the valve.
[0024]
The branch path 12 has a portion opened on the side peripheral surfaces of the lower main body 2 and the upper main body 3 for the convenience of machining and maintenance, but this portion is a screw 13 or the like as a closing member during normal use. It is sealed by. During maintenance or the like, the inside of the branch path 12 can be cleaned by removing the screw 13.
[0025]
A cylindrical pilot valve seat 14 is provided on the attachment portion 3 a provided at the center of the upper body 3. The pilot valve seat 14 has a male screw portion that is screwed into and fixed to the female screw hole of the attachment portion 3a. A communication hole 14 a is formed inside the pilot valve seat 14, and the communication hole 14 a is open to the side peripheral surface and connected to the first half of the branch path 12. The communication hole 14a is opened at the center of the upper surface of the pilot valve seat 14 through an oil passage hole 14b, and communicates with the branch passage 12b in the latter half of the upper body 3 through the oil passage hole 14b. A packing is interposed between the side peripheral surface of the pilot valve seat 14 and the mounting portion 3a so that fluid does not leak from the communication hole 14a.
[0026]
If the pilot valve seat 14 is rotated, the axial position of the pilot valve seat 14 with respect to the upper body 3 can be adjusted by the screw mechanism. By this adjustment mechanism, a fine adjustment can be performed so that a voltage applied to a solenoid, which will be described later, is proportional to a flow rate at the pilot valve seat 14.
[0027]
A concave step portion 3b communicating with the oil passage hole 14b of the pilot valve seat 14 and the branch passage 12b is formed in the upper end surface of the upper body 3 so as to open. A fixing nut 15 is screwed into the recessed step portion 3b. The fixing nut 15 is a substantially annular fixing member, and a movement resistance plate 20 (described later) is pressed and fixed to the concave step portion 3b. An O-ring is interposed between the bottom surface of the recessed step portion 3b and the fixing nut 15 to seal the inside of the recessed step portion 3b of the upper body 3 with respect to the outside.
[0028]
An opening lower end portion of the pipe 21 is fixed to the center of the fixing nut 15. A fixed core 22 is fixed to the upper end of the pipe 21, and a threaded portion 22 a is formed at the upper end of the fixed core 22 protruding upward from the pipe 21.
[0029]
A cylindrical moving core 23 is provided inside the pipe 21 so as to be slidable up and down. Further, a thin plate-like fixed resistance plate 24 made of a nonmagnetic material is provided on the upper end surface of the moving core 23 in the pipe 21, and the moving core 23 in the pipe 21 is abruptly strong against the fixed core 22. Can be prevented from being magnetized. The thickness of the fixed resistance plate 24 may be determined in consideration of the influence of the magnetic field applied to the moving core 23. The fixed resistance plate 24 may be provided at the lower end of the fixed core 22 described later.
[0030]
The moving resistance plate 20 and the valve body 25 as a pilot valve for opening and closing the oil passage hole 14b of the pilot valve seat 14 are attached to the lower end of the moving core 23. As shown in FIG. 2, the movement resistance plate 20 has a large-diameter annular frame portion 26 and a small-diameter annular mounting portion 27 provided concentrically, and is formed by three curved radial arms 28. These two parts are connected. The outer diameter of the annular frame portion 26 is set so that it can be stably engaged with the concave step portion 3b.
[0031]
The valve body 25 has a structure in which a mounting screw portion 30 is formed at the upper end of the base portion 29, and a protrusion 31 that opens and closes the oil passage hole 14 b of the pilot valve seat 14 is formed at the lower end of the base portion 29. And the attachment screw part 30 of the valve body 25 is screwed into the lower end of the movement core 23 in the state which penetrated the annular attachment part 27 of the said movement resistance board 20, and the movement core 23, the movement resistance board 20, and the valve body 25 is assembled integrally. When the moving core 23 is at the lowermost position and the protrusion 31 closes the oil passage hole 14b, the movement resistance plate 20 is in a state where the annular frame portion 26 is in contact with the pressing surface of the fixing nut 15 from below. It has become. At this time, the movement resistance plate 20 is not deformed. Therefore, when the moving core 23 is raised by the action of a coil, which will be described later, and the oil passage hole 14b is opened, the movement resistance plate 20 is configured to bend upward in a convex shape.
That is, the movement resistance plate 20 functions as a leaf spring that urges the valve body 25 moving in the direction to open the branch path 12a in the opposite direction.
[0032]
Next, a coil 32 is provided by extrapolating the pipe 21 on the upper surface of the upper body 3 and the fixing nut 15, and an electromagnetic that moves the moving core 23 in the pipe 21 by a magnetic field generated by the coil 32. A solenoid 33 as drive means is configured. The coil 32 is covered with a cylindrical coil case 34 whose bottom is open. A mounting hole is provided in the central portion of the circular upper wall of the coil case 34. The screw portion 22a of the fixed core 22 is inserted into the mounting hole, and a nut 35 is screwed into the screw portion 22a. 21 and a coil case 34 are attached to the upper body 3 side.
[0033]
That is, when the coil 32 is energized, the pilot valve (valve element 25) is urged in the direction in which the branch path 12a is opened, but at the same time in the direction in which the branch path 12a is closed by the movement resistance plate 20. Receive a biasing force. As a result, both forces antagonize, and the voltage applied to the solenoid 33 is proportional to the flow rate of the fluid supplied from the branch path 12a as the valve body 25 is moved by the solenoid 33 to which the voltage is applied. The resistance force of the moving resistance plate 20 is set so as to satisfy the relationship.
[0034]
In the center of the lower end surface of the upper body 3, the diameter is larger than that of the branch passage 12 and the valve seat 7 of the main valve 8 (therefore, the cross-sectional area at the cut surface perpendicular to the central axis of the cylindrical upper body 3 is large). The first liquid chamber 40 is formed to be open. A branch passage 12 in the latter half of the upper body 3 is connected to and communicated with the first liquid chamber 40. A second liquid chamber 41 having the same inner diameter as the first liquid chamber 40 is formed on the upper surface of the lower body 2. The second liquid chamber 41 communicates with the outlet 6 side of the flow path 4 of the lower main body 2 (that is, the flow path 4 on the downstream side of the main valve 8). A diaphragm 45 as a main valve operating means is sandwiched and fixed between the joined upper main body 3 and lower main body 2 to separate the first liquid chamber 40 and the second liquid chamber 41 from each other. The diaphragm 45 is a pressure transmission member made of an elastic material having a substantially circular outer shape as a whole. The diaphragm 45 has a substantially corrugated cross section so that deformation and movement are easy. The central portion of the diaphragm 45 and the main valve 8 are connected by a rod-like connecting means 46. Therefore, according to this diaphragm 45, when the pilot valve (valve body 25) opens the branch passage 12a, the fluid supplied from the branch passage 12a acts, whereby the first and second liquid chambers 40, 41 are applied. The large valve can be deformed and moved by receiving a hydraulic pressure over a wide area corresponding to a large cross-sectional area, and the main valve 8 can be moved in the direction in which the flow path 4 is opened by operating the main valve 8 with an enlarged large force. .
[0035]
In the upper main body 3, a flow rate adjustable relief valve 47 (balance port) is provided between the valve body 25 and the diaphragm 45 to allow a part of the fluid to escape to an external system. In this example, a hole communicating with the outside is formed in the latter branch passage 12b downstream of the oil passage hole 14b of the pilot valve seat 14, and a relief valve 47 is provided in this hole. This position is advantageous in that it is easy to process and is not easily affected by howling that may occur in the diaphragm 45 during use. The relief valve 47 has a needle-like valve body, and the flow rate of the fluid that escapes to the outside by moving the valve body forward and backward by a screw structure can be freely adjusted. By operating the relief valve 47, adjustment can be made so that the flow rate of the fluid supplied to the diaphragm 45 of the first liquid chamber 40 and the opening degree of the flow path 4 by the main valve 8 are proportional. .
[0036]
Next, the operation of the flow control valve configured as described above will be described.
First, the relationship between the flow rate of the pilot valve and the voltage of the solenoid 33 is adjusted. This adjustment is performed only on the upper body 3 before assembling the body 1.
The origin position of the valve body 25 is detected such that the flow rate is minimum (for example, 0) in a state where no voltage is applied to the coil 32. At this time, the protrusion 31 of the valve body 25 closes the oil passage hole 14b with the weight of the valve body 25 and the moving core 23, and the movement resistance plate 20 is not deformed. Here, when inspection air with a predetermined pressure is supplied from the first half branch passage 12a of the upper body 3, the air enters the second branch passage 12b through the oil passage hole 14b of the pilot valve rod 14 and the gap with the projection 31, Go out of the liquid chamber 40. Here, as the pilot valve seat 14 is gradually turned, the pilot valve seat 14 rises in the upper body 3 and gradually lifts the valve body 25 and the moving core 23. When the annular frame portion 26 of the movement resistance plate 20 comes into contact with the fixed nut 15 from below, the resistance of the movement resistance plate 20 is generated when the valve body 25 is lifted, and the protrusion 31 is reliably secured with a predetermined force. Since the oil passage hole 14b is closed, air at a predetermined pressure does not come out.
[0037]
The pilot valve adjusted in this way can perform control in which the flow rate and the voltage are linearly proportional by adjusting the voltage applied to the coil 32 when a fluid of a predetermined pressure is supplied. When the voltage applied to the coil 32 is increased to move the moving core 23 toward the fixed core 22, when the lift amount increases and the moving core 23 approaches the fixed core 22, the moving core 23 is moved against the voltage increase. The moving force is thought to increase rapidly. However, in the pilot valve of this example, since the fixed resistance plate 24 made of a nonmagnetic material is provided between the moving core 23 and the fixed core 22, most of the region where the force acting on the moving core 23 increases rapidly is the moving core 23. Therefore, the moving core 23 is not strongly magnetized by being strongly strongly magnetized to the fixed core 22. Further, the movement resistance plate 20 is deflected by the movement of the moving core 23 toward the fixed core 22, but the movement resistance plate 20 is more difficult to bend as the deflection amount is increased. That is, when the voltage is low and the moving core 23 is lifted little, the moving resistance plate 20 bends relatively easily, but the voltage rises and the moving core 23 approaches the fixed resistance plate 24, and the force acting on the moving core 23 is rapidly increased. The movement resistance plate 20 is less likely to bend at a point where the movement core 23 starts to increase, thereby restricting a sudden displacement of the movement core 23.
[0038]
Therefore, as shown in FIG. 3, the relationship between the voltage applied to the coil 32 and the lift of the moving core 23 becomes substantially linear, and the opening degree of the valve body 25 is detected from the load of the coil 32 and automatically controlled. The flow rate in the valve body 25 can be continuously finely controlled. Therefore, the fluid pressure in the flow control valve does not change greatly due to a sudden change in the flow rate, and flow control with a wide adjustment range can be realized with the pressure kept substantially constant. Further, the valve body 25 is for changing the voltage applied to the coil 32 to slightly move the moving core 23 up and down to perform proportional control of the flow rate in the flow control valve. Must be surely set to 0, and it is also necessary to avoid unnecessarily deflecting the moving resistance plate 20 at the origin position. As described above, the adjustment of the origin position in the valve body 25 is very delicate. However, since the flow rate control valve of this example uses the screw type pilot valve seat 14 as described above, the minimum flow rate can be simply and accurately. Can be detected.
According to the valve body 25 and the pilot valve seat 14, if the flow rate when the oil passage hole 14b is opened is 0.23 cc, the flow rate is 0.81 cc with respect to the voltage applied to the coil 32 in the range of 0 to 24V. It is directly proportional in the range of ~ 4cc.
[0039]
The upper body 3 incorporating the valve body 25 and the pilot valve seat 14 adjusted as described above and the lower body 2 having the main valve 8 and the like as described above are assembled to obtain the flow control valve having the above-described configuration.
Control is performed by supplying a fluid of a predetermined pressure to the inlet 5 of the flow control valve and applying an appropriate voltage to the coil 32. From the outlet 6, a controlled flow of a desired flow rate of fluid is obtained. That is, the fluid flowing in from the inlet 5 is supplied to the pilot valve seat 14 through the branch path 12a. The valve body 25 moves up and down in proportion to the voltage applied to the coil 32. Here, since the valve body 25 is restricted from abrupt movement by the action of the movement resistance plate 20 which is a specially shaped leaf spring and the fixed resistance plate 24 which prevents sudden magnetic attachment, the lift of the moving core 23 is coiled. The valve body 25 and the pilot valve seat 14 can realize proportional flow rate control with a constant pressure and a wide adjustment range.
[0040]
The fluid exiting from the oil passage hole 14b reaches the liquid chamber 40 of the upper body 3 via the latter half branch path 12b. Since the fluid in the liquid chamber 40 applies pressure to the diaphragm 45, a force corresponding to the area acts on the diaphragm 45. The diaphragm 45 bends downward according to the force received from the fluid, and the main valve 8 connected to the diaphragm 45 by the connecting means 46 also moves downward according to the force received by the diaphragm 45 from the fluid. As a result, the main valve 8 opens away from the valve seat 7 by a dimension corresponding to the force received by the diaphragm 45 from the fluid.
[0041]
As described above, according to this flow control valve, a part of the fluid received from the inlet 5 is led to the pilot valve whose voltage and flow rate are proportional via the branch path 12a, and the flow rate of the fluid applied to the diaphragm 45 by this pilot valve. The main valve 8 is operated by obtaining a large force by receiving the fluid pressure with the diaphragm 45 set to a predetermined pressure receiving area. Thus, according to the flow control valve of this example, although the flow rate of the pilot valve itself is small, the force by this can be amplified by the diaphragm 45 and the amount of movement of the main valve 8 can be increased. Proportional control could be realized.
[0042]
Actually, the flow rate of the fluid released to the outside is adjusted in advance by operating the relief valve 47 so that the voltage applied to the coil 32 is proportional to the flow rate obtained at the outlet 6. When adjusting the relief valve 47, the adjusting member 10 may be rotated to adjust the elastic force of the spring 11 that urges the main valve 8 in the closing direction. Even if the elastic force of the spring 11 varies, the error can be absorbed by adjustment by the adjustment member 10.
[0043]
FIG. 4 is a graph showing the relationship between the voltage applied to the coil 32 and the flow rate obtained by the flow control valve of this example. Here, the fluid was air, the room temperature was 23 ° C., the flow rate when the main valve 8 was opened was 900 l / min, the pressure at the inlet 5 was 4 MPa, and the pressure at the outlet 6 was 3 MPa. As described above, the flow rate control substantially proportional to the coil 32 voltage in a wide range of 150 to 400 l / min could be realized with a differential pressure of 1 MPa at the entrance and exit.
[0044]
Next, the example which used the said flow control valve for the flow control of the fuel injection apparatus in a boiler is demonstrated. As shown in FIG. 5, the kerosene in the kerosene tank 100 is sent to the bypass nozzle 101 by the electromagnetic pump P at a predetermined pressure. Kerosene is sprayed from the nozzle hole 101a into the combustion chamber at a predetermined pressure and burned. A portion of kerosene that has not been sprayed by the bypass nozzle 101 passes through the flow rate control valve at the predetermined pressure and flows back to the kerosene tank 100. Here, the temperature in the furnace of the boiler is constantly monitored by a sensor, and if the coil voltage of the flow control valve is automatically adjusted by feeding back the deviation between this value and the target temperature, the flow rate of kerosene circulating in the system can be adjusted. The pressure can be increased or decreased finely while keeping the pressure almost constant. That is, proportional flow rate control with a wide adjustment range can be realized by automatic control in a state where the pressure is substantially constant, and the furnace temperature of the boiler can be always matched with the set target value. Further, since the flow rate control valve has a flow rate as high as several hundred liters per minute, it can be easily applied to a large boiler, and can also be used for a natural gas turbine of a power generation device of several hundred kilowatt scale.
[0045]
The present invention is not limited to the embodiments described above, and can be widely used in general for proportional flow rate control of a large flow rate fluid in addition to a dryer having a combustion device, temperature control equipment, and the like.
[0046]
【The invention's effect】
  According to the first aspect of the present invention, the main valve is operated by amplifying the fluid force from the pilot valve in which the voltage and the valve lift amount are proportional to each other by the main valve operating means (diaphragm).By adjusting the relief valve in advance, the continuous and linear proportional relationship between the voltage applied to the solenoid and the opening of the main valve can be reliably set according to the flow rate, pressure, etc. of the fluid to be controlled. it canTherefore, it is possible to realize proportional flow rate control of a large flow rate with a constant pressure and a wide adjustment range.
[0047]
  Also,It is possible to realize a compact structure in which a complicated structure in which a main valve, a pilot valve, and a diaphragm for amplifying and transmitting pressure are integrated is integrated into the main body 1 as a whole.At the same time, the inside of the branch path can be cleaned by removing a closing member such as a screw during maintenance.In addition, the pressure of the fluid that has passed through the pilot valve can be amplified by the diaphragm and reliably transmitted to the main valve, ensuring a continuous and linear proportional relationship between the voltage applied to the solenoid and the opening of the main valve. Can be set.
[0048]
  Also,When the pilot valve is opened by applying a voltage to the solenoid, the leaf spring becomes a resistance within a range where the driving force by the solenoid increases rapidly, and the movement of the pilot valve is restricted. Therefore, the pilot valve opens by a lift amount proportional to the voltage. . Thereby, proportional control as the whole flow control valve is suitably performed.
[0049]
  Claim2According to the flow control valve described in claim1In the described flow control valve, by adjusting the relief valve in advance, the continuous and linear proportional relationship between the voltage applied to the solenoid and the opening of the main valve depends on the flow rate, pressure, etc. of the fluid to be controlled. It can be set reliably.
[0050]
  Claim2According to the flow rate control valve described in claim 1, in the flow rate control valve according to claim 1, the biasing force applied to the main valve by the biasing means is appropriately adjusted by adjusting the mounting position of the adjustment member with respect to the lower main body. Therefore, the flow rate adjusting operation for setting a continuous and linear proportional relationship between the voltage applied to the solenoid and the opening of the main valve can be performed more precisely and efficiently.
[0051]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention.
FIG. 2 is a plan view of a movement resistance plate in an example of an embodiment of the present invention.
FIG. 3 is a diagram showing a relationship between a coil voltage and a pilot valve lift amount in an example of an embodiment of the present invention.
FIG. 4 is a diagram showing a relationship between a coil voltage and a flow rate in an example of an embodiment of the present invention.
FIG. 5 is a configuration diagram of a fuel injection device using a flow control valve as an example of an embodiment of the present invention.
FIG. 6 is a configuration diagram of a conventional fuel injection device using a multistage switching system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Lower main body, 2a ... Through-hole, 3 ... Upper main body, 4 ... Flow path,
5 ... Inlet, 6 ... Outlet, 8 ... Main valve, 10 ... Adjusting member,
11 ... Spring as urging means, 12, 12a, 12b ... Branching path,
20 ... Movement resistance plate as a leaf spring, 25 ... Valve body as a pilot valve,
33 ... Solenoid, 40 ... First liquid chamber, 41 ... Second liquid chamber,
45 ... Diaphragm as main valve operating means, 46 ... Connecting means, 47 ... Relief valve.

Claims (2)

  1. A fluid flow path having an inlet and an outlet;
    A main valve provided in the middle of the flow path to open and close the flow path;
    Urging means for urging the main valve in a direction to close the flow path;
    A branch path provided in communication with the main valve on the inlet side of the flow path;
    A pilot valve provided in the branch path to open and close the branch path;
    A leaf spring that urges the pilot valve moving in the direction to open the branch path in the opposite direction;
    A solenoid for energizing the pilot valve in a direction in which the branch path is opened when energized;
    The main valve is attached to the main valve, and moves when the pilot valve opens the branch path when the fluid supplied from the branch path acts to move the main valve in the direction in which the flow path is opened. A main valve operating means,
    Have
    The elasticity of the leaf spring is set so that the voltage applied to the solenoid and the flow rate of the fluid supplied from the branch path when the pilot valve is moved by the solenoid to which the voltage is applied are in a proportional relationship. and has a flow control valve,
    It has a cylindrical body formed by combining the upper body and the lower body,
    The flow path, the main valve, and the biasing means are provided in the lower body,
    The pilot valve, the leaf spring, and the solenoid are provided in the upper body,
    The branch path is provided and communicated with the upper body and the lower body,
    The branch passage of the upper body communicates with a first liquid chamber provided in an opening on the lower surface of the upper body;
    The outlet side of the flow path related to the main valve of the lower body communicates with a second liquid chamber provided to open on the upper surface of the lower body,
    The main valve operating means includes a diaphragm that is sandwiched between the combined upper body and the lower body to isolate the first liquid chamber and the second liquid chamber, and in the flow path of the lower body. in the flow control valve for chromatic and connecting means for connecting the main valve and the diaphragm is disposed,
    The upper body is provided with an adjustable relief valve that allows a part of the fluid to escape to an external system by forming a hole communicating with the outside in the branch path between the pilot valve and the diaphragm, and allows the fluid to escape to the outside. By freely adjusting the flow rate of the fluid, the pilot valve moves so that the flow rate of the fluid supplied from the branch path to the diaphragm is proportional to the opening of the flow path by the main valve. A flow control valve characterized by that.
  2.   A through hole communicating with the flow path is formed in the lower surface of the lower main body, and an adjustment member that can be moved forward and backward is provided in the through hole. Between the inner surface of the adjustment member and the main valve, The flow control valve according to claim 1, wherein the biasing means is provided.
JP2003088114A 2003-03-27 2003-03-27 Flow control valve Expired - Fee Related JP3875959B2 (en)

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JP2003088114A JP3875959B2 (en) 2003-03-27 2003-03-27 Flow control valve

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